diff --git a/wp-includes/widgets.php b/wp-includes/widgets.php
index 66003c869..5a8678014 100644
--- a/wp-includes/widgets.php
+++ b/wp-includes/widgets.php
@@ -164,8 +164,13 @@ class WP_Widget {
 		$this->_set( $widget_args['number'] );
 		$settings = $this->get_settings();
 
-		if ( array_key_exists( $this->number, $settings ) )
-			$this->widget($args, $settings[$this->number]);
+		if ( array_key_exists( $this->number, $settings ) ) {
+            $settings = $settings[$this->number];
+			// filters the widget's settings, return false to stop displaying the widget
+			$settings = apply_filters('widget_display_callback', $settings, &$this);   
+            if ( false !== $settings )
+				$this->widget($args, $settings);
+        }
 	}
 
 	/** Deal with changed settings.
@@ -222,6 +227,8 @@ class WP_Widget {
 					else
 						$instance = $this->update($new_instance, array());
 
+					// filters the widget's settings before saving, return false to cancel saving (keep the old settings if updating)
+					$instance = apply_filters('widget_update_callback', $instance, $new_instance, &$this);
 					if ( false !== $instance )
 						$all_instances[$number] = $instance;
 				}
@@ -250,7 +257,10 @@ class WP_Widget {
 			$instance = $all_instances[ $widget_args['number'] ];
 		}
 
-		return $this->form($instance);
+		// filters the widget admin form before displaying, return false to stop displaying it
+		$instance = apply_filters('widget_form_callback', $instance, &$this);
+		if ( false !== $instance )
+			$this->form($instance);
 	}
 
 	/** Helper function: Registers a single instance. */